Annoying notice and Cookie problem

  Fungie 20:46 04 Jan 06

I have some how got a little notice coming on my screen when I try to open a webpage as follows -
FAILED DOM. when clicked on a few time it goes away,but appears again when a page is opened ?
I also cannot open Bank log on due to Cookies not enabled ,but Cookies are enable and security set at medium.Any help will be greatfully accepted.

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